In the ancient world, the earth did not move, but the position of the sun, moon, and stars in the sky changed because they were moving around the earth.
As human beings enter the age of science and technology, with the aid of scientific power, we have a new understanding of the earth and the universe. I believe that today’s friends all know that the earth is only one of the eight planets in the solar system. It is a tiny planet that not only rotates on its own but also revolves around the sun.
When we look at the entire galaxy outside the solar system, you will be surprised to find that the sun and the entire solar system are also in rapid motion, and the center of motion is the galactic center. So how fast does the earth move in the universe?
We cannot feel ourselves moving when standing on the earth. This is because the gravity of the earth firmly fixes us and makes our body and the rotation of the earth form a stable balance. This is the relative movement proposed by Newton’s law of universal gravitation. . Due to gravity, objects on the surface of the earth are stationary relative to the earth.
Standing on the earth, we can only feel the movement of the earth by observing the alternation of the four seasons of the earth, and observing the rising and falling of the sun in the starry sky. These are all external phenomena manifested by the earth’s rotation movement. Only when we truly walk out of the earth and stand in the starry sky can you see the earth’s rotation and revolution with your own eyes.
How fast is the earth moving in the universe? It is also necessary to find a reference object. If we use the solar system as a reference object, the rotation speed of the earth is 0.5 kilometers per second. Is this fast? It is a very slow speed in the universe.
Taking the solar system as a reference, the sun is at the center and it is constant. The eight planets, all celestial bodies and matter in the sun must revolve around it, and the earth revolves around the sun at a speed of about 30 kilometers per second, which is much larger than that of the earth. The speed of rotation.
If we can only observe the range of the solar system, then the sun we see is still. But when we observe the outer space, we understand that the sun is not stationary, it is also moving at high speed. If the Milky Way is the reference object, then the center of the Milky Way is stationary, and hundreds of billions of stars drive the whole The star system moves around the galactic center.
The speed of a star moving around the galactic center is also related to the distance from the galactic center. The closer it is to the center, the faster the movement speed. In the Milky Way, the position of the sun is not at the center, but on a spiral arm called the Orion-Swan arm on the outer side of the galaxy. This location is about 25,000 to 28,000 light-years away from the center of the Milky Way, which is equivalent to being in the outskirts of the Milky Way.
Based on this distance, we can calculate that the speed of the sun around the galactic center is about 220 kilometers per second, which is more than 7 times the earth’s revolution speed. The movement of the sun will naturally drive the movement of the entire solar system. If we stand outside the solar system, you will find that the entire solar system is a whole, moving around the center of the Milky Way at a speed of 220 kilometers per second.
Therefore, taking the Milky Way as the reference object, the earth’s movement speed reaches 220 kilometers per second, which is far beyond the daily travel of 80,000 miles. It can be seen that the earth is equivalent to an “interstellar spacecraft”, which is leading human beings on interstellar voyages and constantly browsing the galaxy style along the way around the galactic center. At this rate, we need approximately 225 million to 250 million years to make a full circle of the Milky Way.
The solar system as a whole moves cyclically around the galactic center, which has a great impact on the earth and humans. I believe that many of my friends are very curious about alien civilizations. Human beings have been searching for alien civilizations after they left the earth, but we still haven’t found anything until now.
Although we have not found any alien civilizations in the universe, there are many traces of suspected alien civilizations that have visited the earth. If the earth has ever been visited by alien civilizations, how did they come? If the alien civilization has the ability to travel between stars, it can come to the earth in ancient times, then it can naturally come to the earth easily now.
However, in the history of the past thousands of years, there is no real record of alien civilizations visiting the earth. Why is this happening? This situation may be related to the solar system revolving around the Milky Way. I believe my friends all know that the star system revolves around the Milky Way, and the orbits of different star systems are also different, so the near and far points of the two star systems will appear in the process of motion.
During the revolution of the solar system, if it reaches the closest point with another star system with intelligent civilization, the distance between the two will be greatly shortened. In this case, the alien civilization can be easily observed In the case of the earth, since the distance between galaxies is very close at this time, as long as the alien civilization has the basic interstellar navigation ability, it can come to the solar system and visit the earth in a short time.
As the galaxies are still in motion and the distance between the two star systems is increasing, the time for alien civilizations to visit the earth will not be too long. If they stay too long, they may miss the best time to return. Never return to his home galaxy. This is the same as the exploration of Mars by humans. The probe needs to be launched within the closest time window of the two.
Some scientists speculate that the several ice ages experienced in the history of the earth may also be related to the revolution period of the solar system. It is important to know that in the Milky Way, different locations and environmental conditions will be different. It is possible that during a certain period of time, the solar system just revolved to a relatively cold starry sky region of the Milky Way, which brought a long period of cooling to the earth and ushered in the Great Ice Age.
The above is just the case with the Milky Way as the reference object. It should be understood that the Milky Way is just a dust in the vast universe, and there is even more vast space outside it. Standing outside the galaxy, we will find that the galaxy is also not stationary, it is also undergoing revolution while rotating, but at present we still have many unsolved mysteries about the revolution of the galaxy, looking forward to the future Scientific cracking.